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Technical FAQ

 

Q: What are the advantages of the ER type toolholding systems?
A: Major Benefits

  • High Accuracy. 16 slot full radius contact design of the ER collets manufactured on precision machines ensures more accurate clamping with very low run-out tolerance (0.0006") and higher gripping strength than comparable toolholding systems. Jobs are performed to fine tolerances without risk of cutters being pulled out destroying your precious work.
  • Ease of Operation. Changing a collet is fast and with a set of collets that covers a continuous range of metric as well as imperial sizes you'll have every major size available for any job that may come to you.
  • Versatile. Same collets can be used for drilling, milling, tapping etc. Smaller machines Z-axis travel distance is not reduced as much as when fitting drill chucks and other adaptors.
  • Long life. Made of high grade 1065 carbon steel, case hardened and precision ground with 100% quality inspection For precision and long life.
  • Industrial standard. DIN6499 standardization means precision, interchangeability between different brands and access to spares over time

ER Collet Concentricity - per DIN 6499

METRIC

INCHES

 

Clamping Range D

L

Maximum T.I.R.

Clamping Range D

L

Maximum T.I.R.

 

Min.

Max.

Precision DIN 6499

Min.

Max.

Precision DIN 6499

   

1.0

1.6

6

0.015

0.039

0.063

.026

0.0006

   

1.6

3.0

10

0.063

0.118

0.394

   

3.0

6.0

16

0.118

0.236

0.630

   

6.0

10.0

25

0.236

0.394

0.984

   

10.0

18.0

40

0.020

0.394

0.709

1.575

0.0008

   

18.0

26.0

50

0.709

1.024

1.969

   

26.0

34.0

60

0.025

1.024

1.339

2.362

0.0010

   

Q: What ER collet sizes are available?
A: See table below 

ER Collet Model

Dia.     mm

Length mm

Gripping Range

Number of Collets

Spindle Adaptors

Applications

Mm

Inch

ER8

8.5

13.5

0.5-5

1/64-3/16

9

MT#, R8 Spindles, other industrial standards and customized flange mounts

Milling, Drilling, Turning, Grinding,     Engraving, Marking

ER9

9

14.5

0.5-5

1/64-3/16

9

ER11

11.5

18

0.5-7

1/64-9/32

13

ER16

17

27.5

0.5-10

1/64-3/8

10

ER20

21

31.5

1-13

3/64-33/64

13

ER25

26

34

1-16

3/64-5/8

15

ER32

33

40

2-20

3/32-25/32

19

ER40

41

46

3-26

1/8-1

23

ER50

52

60

5-34

3/16-1-11/32

29

ER60

61

60

10-40

3/8- 1-9/16

30

ER90

91

89

20-60

25/32-2-1/8

40

Q: What Morse Taper chuck size will fit my machine?
A: The taper itself is roughly 5/8" per foot, but exact ratios and dimensions for the various sizes are given below.

Morse Taper

Taper

Gauge Line Diameter

Minor Diameter

Taper
Length

Angle

0

19.212:1

0.3561" (9.045mm)

0.252"

2.00"

1°29'27"

1

20.047:1

0.4750" (12.065mm)

0.369"

2.126"

1°25'43"

2

20.020:1

0.700" (17.780mm)

0.572"

2.562"

1°25'50"

3

19.922:1

0.938" (23.825mm)

0.778"

3.188"

1°26'16"

4

19.254:1

1.231" (31.267mm)

1.020"

4.064"

1°29'15"

5

19.002:1

1.748" (44.399mm)

1.475"

5.188"

1°20'26"

6

19.180:1

2.494" (63.348mm)

2.116"

7.252"

1°29'36"

7

19.231:1

3.270" (83.058mm)

2.750"

10.00"

1°29'25"

 

Q: Apparantly the collets will not seat in the clamping nut?
A: This is actually a clever design feature of the ER tool holding system.

There is an eccentric retaining ring in the clamping nut. It serves to ensure that the collets are not getting stuck in the chuck taper when you release the clamping nut after use. The way to install the collets into the clamping nut is as follows:
1. Skew the collet a bit and twist it into the clamping nut
2. Install the clamping nut on the chuck body and tighten slightly
3. Insert the cutter or work piece to be held.
Reverse to release

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